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MROVEMENT EN LWrWATER DETEGTORS.

B. E. BARTL, OF PELADELPHA, PENNSYLVANIA.

LettcrsPa/tmt No. 50,463, datati eeember 18, 1856.

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TO AALL WHOM IT MAY CONOERN:

Be it known that I, B. H. BART/5;, o1" Philadelphie, Pennsylvania., haveinvented an Improvement in Steam Boilers; and I do hereby fleolnre theJfollowing to be n full., elem, and exact `description of the seme,reference being had to the accompanying drawing, and to the letters ofreference marked thereon.

My invention consists or e. ber of motel arranged in respect to theproper water line in n steam-boiler, sind having o communication with esteam-whistle or other olern, as fully describen hereafter, so that thedilference in temperature between the water onli the steam in the boilerznfiy ori-use the rocl to give nn alarm when the wai-ter is too low. i

In order to enable others skile. in the art kte ineke emi apply myinvention, l will new proceed to L lescribe its construction :incloperation. 0n reference to the accompanying drawing which forms n. partof this speciioetion- Figure lis n sectional elevation of my improvedlow-enter fle-toeter, showing,r the seme applied te :t steem-boiler.

Figure 2, e seetionnl elevation drawn to :tn enlarged seele; and

Figure 3, e, plan view of 2.

A is a. metal tube which projects through and is secured to the shell ofe stoom-boiler, X, the lower ond of the tube extending to e point belowwhieh it would be unsafe for the level ofthe water te remain. In thetube above Vthe boiler is a. valve-chest, a., in which is nn ordinarystep-valve, and zit the upper end of the tube is a box, B, te which isseeurecl e steam-whistle, The tube A enlarged in diameter :t shortdistance above the valve-chest a, unil :ic-ross this eniergefl portionextenfls e cross-piece, o, to which is secured the lower end of n Zinerofl, ci, the upper ond of the letter projecting through e stuilingboxin the top of the box B; und over the end of the rofl projects the outerrin oi' e lever, c, wheh is hung to e projection on the whistle C. Theinner emi of the lever is so conne i to the valve which closes thecommunication between the whistle :ind the box B, that when the outeremi ot' the lever is raised the seid valve will be opened. At the upperedge of the box B is en annuler rib, z', forming n cup er reservoir withwhich communicates a. pipe, lc, the latterextenclingeever nn beyond theside of the boiler, for n. purpose described hereafter. So long as thesurface of the water in the Yboiler is above lower emi of the tube A.,and the letter is fille. with wntor or with oir, the parts will remain.in the position shown in the drawing; when, however', the surface efthe water in the boiler is below the end of the tube, the steam willgein access to the somo, and being et o higher tenperetnre than thewater or nir which previously illecl the tribe, will heat and expend therod to such en extent that its upper end will elevate the lerer e, andcanse the whistle to give a-n alarm. When the boiler is replenished'withWater, and the surface ot' the latter rises above the end of the tube,it will be i'oroed np the seme, and in consequence of its lowtemperetnre oompa-red with that et' steam, will instantly cause the berCZ to contre-ot to sueh en extent that its end will pass from Contactwith the lever c, the letter end the valve being .thus brought to theirfirst positions, end` the further escape of steam to the whistle beingprevented; The condensed steam which drips from the whistle into the cupor reservoir at the top of the box E, is conduotell by the pipe'k to anydesired peint, the dripping of the Water on to the surface of the boilerbeing thus prevented. In platee of aJ rod, ot, of zine, a. rod or bar ofother metal or alloy may be used. 'The tribe A end the rod d also may bearranged in a different manner from that described; for instance, theymay be placed horizontally Within ai, boiler in suoli. :t position es tobe covered by the water, except when the letter descends below thelow-water line.

It will 1oeseen that the above-described apparatus is simple in itsconstruction, compact, strong, and not liable to get out of order or tobe injured by rough treatment.

I de not desire to claim broadly 'the combination oi a rod and estenm-boiler, so that the'vdiierence in the temperature between the wterand steam may cause the rod to give :in alarm when the writer is low;but I claim Aas my invention, and desire to secure by Letters Patent Thepipe A, rod ci, and steam-whistle C, constructed and` arranged. inrespect to oooh other :incl to e steam boiler, substantially asdescribed.

In testimony whereof I have signed my name to this speciiication in thepresence oi' two subscribing witnesses.

B. Il. BRTOL.

Witnesses: v

GARRET F. FLOOD, Cms. H. FULLAWAY.

